<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link href="./styles/style.css" rel="stylesheet"/>
</head>
<body>
    <div>第一个</div>
    <div id="second">第二个</div>
    <div id="second1">第三个</div>
</body>

</html>